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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5070079828ae537a0ac460091b42aabae6d077727d2e6557a4ea2f7915daa5e4' 
  AND token = 'Q4OQPeBLqVLuMH/KUO555/IvfLaU8VGKjuTp76py8OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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