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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22fc18dfc629802c7e1562ae05a8dc0649bdd8828fa31924a7539de092c2d12c' 
  AND token = '5KTrHsFa9CoiJ1BXF0RejeUojAYso3mkbVqIW5DXXBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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