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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a55d0ca57ee4c3c743c7e157ca1f9e75310bc99a022acaa3bcb031ddb75385' 
  AND token = 'iBsD0AAbw2dudCAyu9z4L7/f9fl5+Zy7rbJcLDassCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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