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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4097ad2b571f4142182a21bedac5bf98e6e87f4026a6571ec2bae34d9659bfc' 
  AND token = 'nofmuXNFJFc+trZNF00+oxMRRLq0q3mZWnyaq6w/JZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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