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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5da2b04517354f9006e82a7715e787583c072f89a6660613647ff89d7333ed0' 
  AND token = 'aQzwF+I5HQ3H/fKeQQ1VmwgS/6kL8E09Gxodl50C/Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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