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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd712168a7703c1a9b9047526d96fedcc260b3d61e05524b73350fb6ff002a6' 
  AND token = 'Il52IQ7y388LuVCHnYH0rjkf12OdhxqqaGjGY6hZOHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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