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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e065b7f88b3eea6ed161c5ab4f21fb47a2852f7375a1772b1ffe7a3f93d884b' 
  AND token = 'A8tS1jLBDxbU742LA5BS+YG48MAJ2z4tH6S56ofkjlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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