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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e410a096e7376bc7ae2927a2a32f38dfb8cdaa615588c9b08daa7656fa01733b' 
  AND token = 'mLjZYSpJR93sGRvpYF+CUvPtOV7WEwri32rP60M5S4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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