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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57cb2b2b6ec6c7717f4019236ff28505c8331e269a336b10cf0663e26a80e90' 
  AND token = 'p1YKiQBoo9OvzyBS679mV6cbOn96GXxnkOcV94Izzos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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