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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc96ca69ec44bf62fd3157d0d0e4bd26968e1c3418270c6685c40c711b169d60' 
  AND token = '1Ik9R9oWl6Rm0nbRr4agRWeaDA0TuPs7x5WTH2j/ISw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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