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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737d16ab5cc59d2baee0bb1ae21d842825cd1c1b543fbb7ff73e07d8696b7226' 
  AND token = 'lDjn2bfPErPNgb8THGQI3+v7iZuNCcyGrJSSjdsBw4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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