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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77beed0f7c61ce2b3cade08a9bf90e3090b6a6182873e896490a246a8dfe40d' 
  AND token = 'USB1ED6MxzYjjlmJA5QM9GdK8lBP3ClRCGX4/bVXFcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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