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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03c8b219439906fe0f850e3ae4fdf2c68f5d11896a0c5cddf84e11503453865' 
  AND token = 'KhNh18e1cR7HMDyWHZf6D7+gNTDGhMK6JdduUaXPUa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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