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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f09f0787482125b1ab1b24278bed109ee0d24e0f883212af2c55d032fcec35' 
  AND token = 'zwA1taNaAPlhxhjsL4vvIqogWANO6XUbUVrIGB4Ghpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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