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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab554e8b7f010c1bef21da5a2b99507543e8bfbfc26b155f9ed8b591ef20d4c7' 
  AND token = 'vyyL1H6MZIAGSs8H7Ur6bJtT3y8q8FuuThCP7DjiGsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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