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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b562387fca0072e4108b19de33b5c1969ab388dd46cb2c8d5c696e0a13855fbe' 
  AND token = 'FPCu0d3BHOaFKc9ePsU6cgZDqP+DkDhOWJzRU/1sHs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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