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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215ff04e9b9be62d0a252d0ced5880a7a8163d6619df639ff76a7a7debc8cda4' 
  AND token = 'unOAMwp/rJbDLfEuwJe2nPdW8En+sR7xvuJvHS1xpfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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