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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e704d37fa8ce7f9539a20fe690a4ade8ccf63eee8169068c6c2fb45dc5ece2' 
  AND token = 'Ua2LahEJZga2xCRklqN8I962Ai+QxxTYPeS6z0yEt6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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