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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9538c185a629715f01370b125c38cb6cd3dd527defb91851a8d40528ee9b1e6' 
  AND token = 'j++nENP2kDFJ6/5b61dkLzHt3ZiL1qwxamYXpETslYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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