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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5704d6c3302a76eb95ca0a598e75de2b60f49af0f8c3d913f8c09f2118ec47e0' 
  AND token = 'QmhkC2kIL5KL6U0fvnQYISh/EMO2DSkHBiNTeztfdgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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