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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fde8f250e6aa4021ea6b9e888676737ab3183bf7cf8bd32a5ffa63193722036' 
  AND token = '1Llb4xxZCnG+sva/6SxrB9hAKAAOnMfmBquuoib4Rzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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