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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474811b0acb7cc0b4a4493401be8454e70d79ac9607cb076533f19c9e426ab89' 
  AND token = 'svZI+Khm+NnRImPmmtMn8J7GsuxliC13GNqoy00Fr7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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