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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08df013f3cb81ac4b43110dc8867d7056bd7914438cabda4aa99a1e513c5a04a' 
  AND token = 'l+cdfwyEHx99Ttc0AvJNTINSlFTHk0AX0/gyG7/P5r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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