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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb7d63996aa728f3f98851c58c842fb36b4f8b633bc521fb84430a2bcea132e' 
  AND token = 'hy8w3/fs4QGhD+1jtM37tquqMeNRfpEH/u5bJXrJfgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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