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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c716e71a1bc28de9f4a936bc1710593dbae20209da4fd3298a95fe581a7b964' 
  AND token = 'Q5D45RFNl+3fcGeles3tJY63ajs89iODl0uFU7mKQrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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