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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad065e74e2f15388b18f11aef420d3ed844ac1076b75383bfc4e57e6a5fae3b' 
  AND token = '+1NRg2v7G4NkHG/ZVGKABsbE6ag5b6GV1/Z0V4ubBXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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