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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992785c9a14b25added2532904c37fb50b4d8f932801b20759e59e4ed573d086' 
  AND token = '0Rwgjrjsh84xMkL4lx0sg8CoZLoim6ayqmp5jGuvBH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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