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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41dd7dd7ff617b4463dc7686f0f41ac0cffb7becdc775bfe202e048771c2213' 
  AND token = 'pH+PD9MUix0mcisyTj2empkNNaHCppVTWwHRj27Fg+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}