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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be11d066768e6615f9fc8c18f45723f31adbb12a1ed06fdc7481e2b3965dce08' 
  AND token = '+YWuCIekJTNsC6xCFusDQ2I8nZt3QWGuP6ouS4T2Yq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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