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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f984f89a71c476791c5b769dabcf5e7770e91fcbd765473ea12b64f12f4e3d17' 
  AND token = 'pA6xrSSK+WUFIQFx8qsm0LSxrAOHn1ITA8PSboRDnpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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