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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c87b3cac765bf2e10a124294ba0bdc148d1d4ef0c3e629749a25d228fed4c6' 
  AND token = 'QSmDelQ0IoGt6mbf1tJv81vH4YcRljDv0zfHpw34q4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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