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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0830bf8a67fc6e60fe65a1de531ea4eadefb24fc2e7381b5a76a63be1beaf80a' 
  AND token = '2s5ay+4jYfVaC8Qxd9b3vr5UrOmqSpIPFViUk1Zlr08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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