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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee2ec5f9a817212106e3cf553160d4de9ffa6110e974c85a0179b49d1e2b1fb' 
  AND token = '0QqQkCAiegL8ON51I0VT9CKpZ7/IfNvGrJ0NS1gjVio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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