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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a15be305ecc558a484683bc399a744c41532ce9f4f8d6c91cdffc6aa6a5b9a' 
  AND token = 'FdZRm+oO/qB3CkqHa7KkZNNCsooAFkqbwh2v5HNivgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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