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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c14a716aa3b9bac2ea09fd1e2ae69af5d8e27b3fed1e5593776360b3c9dc9e' 
  AND token = 'zU1Gty+rpjA4dfC0hlEG6ChhcLL1FyX7Y37QrUxX73E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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