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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fccead886fb07f68f7611584d67d3009a6703c1bb0b371db97f07c2064e1b78f' 
  AND token = 'hExppzrzs9LAuCtuzLJBmBN1CQfM3IoCFxv0ORW99kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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