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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47c21c75cea04545ce50df3abbc8cc343df746fee9feca65e3b5155fe3fe209' 
  AND token = '1F+lKqT9OxHwZdZAXjtWE2vTJjlGPTVDa0Q5FEjhV2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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