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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '022f732e1a972c0232b8dc6fb5bc938aa13ac64ea55e6611971d365f9e07846e' 
  AND token = 'C/znUKCbrvur73IAyZ89/mWHC67Vs4+tHo5//jiSf84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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