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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfaa71d0e84ce2cd17ca1b11f60e0b6bf0d1f7f8aae22686d382eb82b2430a1b' 
  AND token = 'f2i9S4S0HhgrqnDzStWR/Yn1AFP4qO3858/X53H82sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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