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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1750952aaea87fbd468771ba909c8d6e743bdcacea72be83b5627d53f18a32c8' 
  AND token = 'HlXv3OUU24oRHHfZW6Qo6ov3N3vdIOXw1z2bhCmPwiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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