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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7147c6ea10d76c4764bf4f1d2eadd29ea3a0cff3cb8e6005cf55a56ea24a2b83' 
  AND token = 'eEcnYOoiVVQaOLkyxTC5Zzf0l1+vV7Wp1YJKGlWTB4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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