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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69917ac896ae00ededef6e6febf638744133a28f51de7c219a1c653e4939acc7' 
  AND token = 'gupSH+TxkfcObneDKynlOeRmbOL2Aq4P1/Sq2b/RtFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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