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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7730b4974f78fc7681b6f09590b7983e03dd617cee2a9fda83e8b452a50acca2' 
  AND token = 'TfVqdd0UdGDnlNByam05LKaLWmc4znLGmymbT4CP1yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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