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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29065190ed6fab90297d78b3fd0d7cb7c796b254035ecc1dd6e81ffac5312ad' 
  AND token = 'oiq85B45otrlhGMBvp79MTsrmwsp2GayhUvykQpXzlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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